Initial expressify test

[SoongNoonien]

I took a little closer look at the expressify system. Apart from the obvious fact that the doctests will still fail I see two other problems. The result of an ordinary scalar product is a GenericCycloFrac for technical reasons. This leads to scalar product results like 1//1 instead of simply 1 . Another problem is that obviously expressions like exp(0) are not automatically simplified to 1. So without any manual intervention things like 0//exp(0) will be printed.

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 68.75%. Comparing base (4f3c27c) to head (d3f408a).

Files with missing lines	Patch %	Lines
src/GenericCyclotomicFractions.jl	0.00%	2 Missing ⚠️
src/GenericCyclotomics.jl	66.66%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (4f3c27c) and HEAD (d3f408a). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (4f3c27c)	HEAD (d3f408a)
	11	8

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #248       +/-   ##
===========================================
- Coverage   95.98%   68.75%   -27.24%     
===========================================
  Files          12       12               
  Lines         846      816       -30     
===========================================
- Hits          812      561      -251     
- Misses         34      255      +221     

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